Do you mean running an XX1 chainring/crank with a 10 speed cassette & mech?

XX1 chainring runs fine with a 10 speed set up. Friend of mine does exactly this.

If you’re looking to do this, cheaper option is a thick/thin chainring from Works Components / Wolf Tooth / Raceface / and loads of others. They all do the same job. They work best with a 10 speed chain (even on a 9 speed set up).